But in general , every game does not move their character much . They moves their background. But when a person plays, its seems everything is moving around. In android we draw an background with one bitmap. And we start slowly moving background. This is important part game development.

Suppose one's want to develop a game in which, one's have one actor who's running all the way. Then real game scenerio will be like that

Animate actor on same place

Move the background in opposite direction

Moving background is quite simple, we scroll one image to some position and same image's another instance to respective direction to cover the space left by first one. and so on.......
This process need same image to draw continueously two times to fill the gap and never ending scrolling or moving of background

Look at the respective code in which backGround bitmap is background of canvas.....